Example: Multiple connections that work on a transaction

import java.sql.*;
import javax.sql.*;
import java.util.*;
import javax.transaction.*;
import javax.transaction.xa.*;
import com.ibm.db2.jdbc.app.*;
public class JTAMultiConn {
   public static void main(java.lang.String[] args) {
      JTAMultiConn test = new JTAMultiConn();
      test.setup();
      test.run();
   }
/**
* Handle the previous cleanup run so that this test can recommence.
*/
   public void setup() {
      Connection c = null;
      Statement s = null;
      try {
         Class.forName("com.ibm.db2.jdbc.app.DB2Driver");
         c = DriverManager.getConnection("jdbc:db2:*local");
         s = c.createStatement();
         try {
            s.executeUpdate("DROP TABLE CUJOSQL.JTATABLE");
         }
         catch (SQLException e) {
         // Ignore... does not exist
         }
         s.executeUpdate("CREATE TABLE CUJOSQL.JTATABLE (COL1 CHAR
                         (50))");
               s.close();
      }
      finally {
         if (c != null) {
            c.close();
         }
      }
   }
/**
* This test uses JTA support to handle transactions.
*/
   public void run() {
      Connection c1 = null;
      Connection c2 = null;
      Connection c3 = null;
      try {
         Context ctx = new InitialContext();
         // Assume the data source is backed by a UDBXADataSource.
         UDBXADataSource ds = (UDBXADataSource)
                              ctx.lookup("XADataSource");
         // From the DataSource, obtain some XAConnection objects that
         // contain an XAResource and a Connection object.
         XAConnection xaConn1 = ds.getXAConnection();
         XAConnection xaConn2 = ds.getXAConnection();
         XAConnection xaConn3 = ds.getXAConnection();
         XAResource xaRes1 = xaConn1.getXAResource();
         XAResource xaRes2 = xaConn2.getXAResource();
         XAResource xaRes3 = xaConn3.getXAResource();
         c1 = xaConn1.getConnection();
         c2 = xaConn2.getConnection();
         c3 = xaConn3.getConnection();
         Statement stmt1 = c1.createStatement();
         Statement stmt2 = c2.createStatement();
         Statement stmt3 = c3.createStatement();
         // For XA transactions, a transaction identifier is required.
         // Support for creating XIDs is again left to the application
         // program.
         Xid xid = JDXATest.xidFactory();
         // Perform some transactional work under each of the three
         // connections that have been created.
         xaRes1.start(xid, XAResource.TMNOFLAGS);
         int count1 = stmt1.executeUpdate("INSERT INTO " + tableName + "VALUES('Value 1-A')");
         xaRes1.end(xid, XAResource.TMNOFLAGS);

         xaRes2.start(xid, XAResource.TMJOIN);
         int count2 = stmt2.executeUpdate("INSERT INTO " + tableName + "VALUES('Value 1-B')");
         xaRes2.end(xid, XAResource.TMNOFLAGS);

         xaRes3.start(xid, XAResource.TMJOIN);
         int count3 = stmt3.executeUpdate("INSERT INTO " + tableName + "VALUES('Value 1-C')");
         xaRes3.end(xid, XAResource.TMSUCCESS);
         // When completed, commit the transaction as a single unit.
         // A prepare() and commit() or 1 phase commit() is required for
         // each separate database (XAResource) that participated in the
         // transaction. Since the resources accessed (xaRes1, xaRes2, and xaRes3)
         // all refer to the same database, only one prepare or commit is required.
         int rc = xaRes.prepare(xid);
         xaRes.commit(xid, false);
      }
      catch (Exception e) {
         System.out.println("Something has gone wrong.");
         e.printStackTrace();
      }
      finally {
         try {
            if (c1 != null) {
               c1.close();
            }
         }
         catch (SQLException e) {
            System.out.println("Note: Cleaup exception " +
                               e.getMessage());
         }
         try {
            if (c2 != null) {
               c2.close();
            }
         }
         catch (SQLException e) {
            System.out.println("Note: Cleaup exception " +
                               e.getMessage());
         }
         try {
            if (c3 != null) {
               c3.close();
            }
         }
         catch (SQLException e) {
            System.out.println("Note: Cleaup exception " +
                               e.getMessage());
         }
      }
   }
}